And My Suggestion start with this URL: https://hackr.io/blog/python-arrays

PHP is a programming language.
NodeJS is not a language itself, its a platform.

NodeJS is a platform which runs javascript on server-side and comes with some set of javascript functions, modules, helpers. Apart from that whatever logic you are writing is in JavaScript language.

To understand and learn programming and web development concept you should learn both PHP and Javascript and then you can Jump to NodeJS.

Check here further information or detailed difference between PHP vs Node.js: https://hackr.io/blog/...

PostgreSQL handles transactions better. The only way to do it in MySQL is with InnoDB, but PostgreSQL does it better and it's more native. Much more query features of SQL than MySQL. Detailed info: https://hackr.io/blog/...